Answers to Questions and Exercises: Doing More With Rich Internet Applications

Questions

1. Question: True or False: Rich Internet applications (RIAs) can set secure properties by prefixing the property name with "jnlp.".

   Answer: True: Rich Internet applications (RIAs) can set secure properties by prefixing the property name with "jnlp." or "javaws.".

2. Question: True or False: Only signed RIAs can use JNLP API to access files on the client.

   Answer: False: Unsigned RIAs can also use JNLP API to access files on the client.

Exercises

1. Exercise: To the following JNLP file, add a secure property called jnlp.foo and set its value to true.

   <?xml version="1.0" encoding="UTF-8"?>
   <jnlp spec="1.0+" codebase="" href=""> <information> <title>Dynamic Tree Demo</title> <vendor>Dynamic Team</vendor> </information> <resources> <!-- Application Resources --> <j2se version="1.6+"
                 href="http://java.sun.com/products/autodl/j2se" /> <jar href="DynamicTreeDemo.jar" main="true" /> </resources> <applet-desc
            name="Dynamic Tree Demo Applet"
            main-class="components.DynamicTreeApplet"
            width="300"
            height="300"> </applet-desc> <update check="background"/>
   </jnlp>

   Answer:

   <?xml version="1.0" encoding="UTF-8"?>
   <jnlp spec="1.0+" codebase="" href=""> <information> <title>Dynamic Tree Demo</title> <vendor>Dynamic Team</vendor> </information> <resources> <!-- Application Resources --> <j2se version="1.6+"
                 href="http://java.sun.com/products/autodl/j2se" /> <jar href="DynamicTreeDemo.jar" main="true" /> <property name="jnlp.foo" value="true"/>
       </resources> <applet-desc
            name="Dynamic Tree Demo Applet"
            main-class="components.DynamicTreeApplet"
            width="300"
            height="300"> </applet-desc> <update check="background"/>
   </jnlp>